Galactosemia:

Galactosemia is an autosomal recessive disorder that results from the defective activity of galactose-1-phosphate uridyl transferase (GALT) enzyme. Newborns are typically asymptomatic, but may present with hyperbilirubinemia or E. coli sepsis. If an infant is not screened and/or left untreated, symptoms begin to appear early in infancy, and can include poor feeding, failure to thrive, liver dysfunction, and mental retardation